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DENTAL PLUGGER.

No. 333,777. I Patented Feb. 23, 1886.

WITNESSES INVENTOI? ".IIEYERS, Piano-Mm. WMMYIM D.C.

UNITED STATES ,PATENT OFFICE.

RICHARD WlLLIAMS, OF NEW YQRK, N. Y.

DENTAL PLUGGER.

SPECIFICATION forming part of Letters Patent No. 336,77'l,dated February23, 1886.

A pplical ion filed February 4, 1885. Serial No. 154,900. (No model.)

To all whom it may concern:

Be it known that I, Brennan S. WILLIAMs, a citizen of the United States,residing in the city, county, and State of New York, have made a new anduseful Improvement in Dental Pluggers; and I declare the following to bea full, clear, and exact description of the same, reference being had tothe accompanying drawings, forming part of this specification.

This invention has for its object an improvement in dental instruments;and the invention consists in a rotary plugger with one or more groovesformed therein in the manner and for the purpose hereinafterparticularly shown, described, and claimed.-

In the accompanying sheet of drawings, Figure 1 shows the instrumentattached to a handpiece of a dental engine; Fig. 2, instrument havinghead with V-shaped grooves, partly in section. Fig. 3 is a plan view ofhead. Fig. 4 shows instrument, partly in section, having modified formof head shown in Fig. 2; Fig. 5, a head with grooves forming re-enteringangles.

It has recently been discovered that effectual and less inconvenientplugging may be accomplished with the aid of the well-known dentalengine, the instrument rotating rapidly while being pressed against thefilling in the dental 3o" cavity, the rotating plugger and pressurespreading and compacting the filling within the walls of the cavity. Theonly objection to this way of compacting the filling is the polish thatis given to the surface of each sucees sive layer of gold of which thefilling is com posed; and to obviate this, as well as to assist theadhering of the separate layers of metal foil, is the purpose of thisinvention, To that end I construct my plugger A with a conical or anyother convenient head, a, which, however, must be circular in section,and form around it a series of concentric grooves, b, so that theirsection may be of the form of an inverted V, as in Fig. 2, or with aflattened top, as in Fig. 4; or,generally speaking, the grooves may haveany form that will not retain the gold in the grooves or cut or abradeit, providing they have not a re-entering angle, as in Fig. 5, intowhich the gold would enter and not only fill up the grooves and sodefeat their object, but tend,also,to cause the foil to anchor itself tothe plugger, which would tear or draw the filling from the cavity uponwithdrawing the instrument. None of these objections, however, obtainwith an instrument having grooves of the forms mentioned and referred toby me.

The head of the plugger having been constructed as described, its shankc is made to fit into any of the well-known chucks or other holdingdevices of a dental engine or other appliance that willimpart to it arotary motion. The filling is placed in the dental cavity, the p'luggerrevolved and pressed against it, the rotation and pressure spreading andcompacting the filling, asbefore described; but instead of leaving apolished surface to receive the next pellet on layer of gold, it will befound that the surface has formed on it one or more concentric groovesor offsets, into which the foil of the succeeding pellet can enter, andthereby be to some extent anchored to the filling already in placewithin the dental cavity, and, besides, this grooving breaks up orprevents the burnishing or polishing, which, as before stated,interferes with satisfactory plugging by means of the dental engine.

I am aware that dental files have been heretofore made with aseries ofconcentric grooves around a conical head; but these files having grooveswith what Icall re-entcring angles were not adapted to thepurposehereinbeibre named. ,I therefore clainr no part of such dentalfiles; but

What I do claim as new, and desire to secure by Letters Patent, is-- 1.A dental plugging device having a circular head provided on its leadingend with a series of concentric grooves made substantially V shape tofreely enter and leave the filling without adherence thereto,substantially as described. i

2. A dental plugging device having a head circular in cross-section andprovided witha conical leading or working end, and formed with a seriesof concentric grooves made of a substantially V sh ape to freely enterand leave the filling without adherence thereto, and adapted to beoperated by a mechanical ro tater or dental engine, substantially asdescribed.

RICHD. S. VILLIAMS.

In presence of-- G. M. ,PLYMPTON, JD. A. CARPENTER.

